Preparation And Performance Study Of Two-electron Layer Organic-inorganic Hybrid Modified Waterborne Acrylic Anti-corrosion Coatings

Corrosion of metals can cause great losses to national construction and national economy,and anti-corrosion coatings are one of the important ways to delay or stop the corrosion of metals.With the increasingly strict environmental protection policy and the rising awareness of consumers,it is urgent to develop anti-corrosion coatings that are both green and eco-friendly and have good corrosion resistance,endurance and good heat durability.Water-based organic-inorganic hybrid coatings can meet the needs of both to a certain extent,both green and environmental protection,but also has high intensity,high toughness,high adhesion,high temperature resistance,aging resistance of excellent performance.This paper aims to develop a water-based organic-inorganic hybrid coating with excellent overall performance,and the main research works are:（1）Epoxy-modified silica sols were prepared by sol-gel method using TEOS and KH560 as raw materials.The effects of the amount of isopropanol,reaction temperature,catalyst and p H on the preparation of epoxy-modified silica sol were investigated by electrical conductivity,FT-IR and exothermic curves.The results showed that the best performance of the prepared epoxy-modified silica sol was achieved at the reaction temperature of 55 when n（IPA）:n（H₂O）:n（TEOS）:n（KH560）=39:13:1:2,using formic acid as catalyst and adjusting the p H to 3.5.（2）The effects of epoxy-modified silica sol on the physical properties,electrochemical properties,thermal stability,corrosion resistance and hydrophobic property of the coatings were studied.The consequence indicated that contrasted with the unmodified coating,the corrosion potential of the coating increased by 216 m V,the corrosion current reduced to 3.19×10^-4 m A,the decomposition temperature increased to 400,and the contact angle increased from 54.6°to 66.2°when the epoxy-modified silica sol was added at1%.（3）Hydrotalcite-based two-electron-layered two-dimensional nanosheets were prepared from magnesium aluminum nitrate hydrotalcite by hydrothermal method and the laminates were exfoliated to prepare hydrotalcite-based two-electron-layered two-dimensional nanosheets.Influence of the incorporation of such two-electron-layered 2D nanosheets on the coating properties was investigated.The results showed that the coating with 6%two-electron layer 2D nanosheets had the best overall performance,with the corrosion potential increased by 510 m V and the corrosion current decreased by 4.19×10^-4 m A.（4）Epoxy-modified silica sols and two-electron-layered two-dimensional nanosheets have a good improvement on the anti-corrosion properties of the coatings.